Malicious PDF — malware analysis report

Static analysis result for SHA-256 8855b0a4b947cfab…

MALICIOUS

PDF

30.8 KB Created: 2020-04-07 16:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c72d498774588ffec78714748a367e8f SHA-1: d5f7fcbf07b2751367456a9c63d1f15f03de0974 SHA-256: 8855b0a4b947cfab457adacad357e16d0ff45ae8f6ed73ece45102a37d31946e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or redirection scheme. No scripts were extracted, but the primary attack pattern appears to be directing users to a network of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nagunabrahman01.com/uploads/1/3/0/6/130604014/130604014.html#brother+hl-3170cdw+service+manual
    • http://55newcavendishstreet.com/uploads/1/3/0/7/130776875/nakovuzolew_lekerujejuwe_dimizivuvumika.pdf
    • http://alchemyenglandapparel.net/uploads/1/3/0/8/130813851/guzare.pdf
    • http://richardsonpia.com/uploads/1/3/1/4/131454482/kowuvun-lexerimu.pdf
    • http://axisdesign-cambodia.com/uploads/1/3/0/6/130604769/takarow.pdf
    • http://hotdudeswithdogs.net/uploads/1/3/1/4/131483550/2072344.pdf
    • http://pinkesports.net/uploads/1/3/1/1/131163955/pumofavabegakapaju.pdf
    • http://sstools.store/uploads/1/3/0/8/130874030/werapaw.pdf
    • http://samwyattart.com/uploads/1/3/0/6/130640095/51275.pdf
    • http://coastroadconsulting.com/uploads/1/3/0/7/130739376/gifufetivavetubo.pdf
    • http://kaiserrollstudios.com/uploads/1/3/0/2/130271043/a4cf6f82b4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054fc.bin
ac08babc20672644918d86bdbf0382206a7522750392575193a3aad5100d73a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FC 6444 bytes

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